If it is the power cable as @ferguson mentioned, I did raise this with eero themselves. I was wondering about using a USB-C extension cable. However, there is a big risk with this, if the internal conductors of the extension cable are not thick enough to carry the current that the eero draws, then they could overheat & potentially catch fire.
If, however, you mean the cable between the eero & ONT, then you just need to buy yourself a longer Ethernet cable, but make sure that it conforms to a minimum of Cat 6 cable.
I have removed your email address from wider view, you should never post information like that in public.
If your eero cable is not sufficiently long to reach from the nearest power socket then I am not aware of any direct solutions. Maybe use an extension cable from the socket? Otherwise, any third-party charger with a USB C connection should do the job.
